In order to analyze the dynamic response of deck pavement in the process of rotating opening of bascule bridge, taking the Tianjin Xiangluowan Haihe Bridge as the research object, this study established a 1/4 fine finite element model of bascule bridge including the rotating shaft. The dynamic simulation of the variable speed opening process of the bascule bridge was carried out, and the dynamic responses of steel bridge deck pavement system at different opening angles and different opening speeds were tracked. The results were compared with the analysis results of the simplified bascule bridge model. which show that the stress concentration of interlaminar shear stress of pavement occurs both in transverse and longitudinal directions during variable speed opening. The tensile stress and interlaminar shear stress of pavement increase with the increase of the opening angle, and reach the maximum at the maximum opening angle. The longitudinal position of the peak is the free end of the structure, and the dynamic stress response of a refined rotating shaft model during its opening is 15% ~20% larger than that of a simplified rotating shaft model. Therefore, it is suggested that the refined rotating shaft model should be adopted in the composite structure of the open bridge pavement system at the design stage.